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    • 1. 发明专利
    • TRIAXIAL WOVEN FABRIC AND ITS PRODUCTION
    • JPH08209492A
    • 1996-08-13
    • JP28625995
    • 1995-11-02
    • NIPPON STEEL CORPNIPPON STEEL CHEMICAL COSAKASE ADTEC KK
    • KIMURA HIROMISHIBATA HIROTAKAKUBOMURA KENJI
    • D01F9/145D03D15/12D03D25/00
    • PURPOSE: To produce a triaxial wove fabric suitable as a reinforcing material having a light weight bad a high modulus of elasticity by using the bundle of carbon fibers started from an optically anisotropic pitch and having a specific crimp releasing ratio. CONSTITUTION: This triaxial woven fabric is obtained by weaving a triaxial woven fabric having 45-300g/m weight, a crimp releasing ratio [(L -L)/L] satisfying [(Lo -L)Lo ]×0.7>=[(L -L)/L]>=0 (L is the length of the warp yarn fiber bundle, Lo is the length along the direction of the crimp of the warp yarn fiber bundle having the length L, and L is the drawing out length of a fiber from the fiber bundle having the length L) and also having a basic structure in which both warp and waft yarns cross each other by the angle of ±60 deg. from the weaving width direction, by using the bundle of carbon fibers made form an optically anisotropic pitch as a raw material and having >=300kgf/mm tensile strength, >=0.6% tensile breakage distortion, >=15tf/mm tensile modulus of elasticity and 40-300g/mm thickness as warp yarn and a weft yarn having substantially the same cross section of the bundle of fibers, and then heat-treating the fabric at >=1800 deg.C under an inert gas atmosphere and immersing it into a resin to obtain a triaxial woven fabric resin matrix composite having >=3tf/mm tensile modulus of elasticity.
    • 9. 发明专利
    • METHOD FOR MEASURING ORIENTATION ANGLE OF FIBER IN CONTINUOUS FIBER REINFORCED PLASTIC
    • JPH06160257A
    • 1994-06-07
    • JP33357792
    • 1992-11-19
    • NIPPON STEEL CHEMICAL CONIPPON STEEL CORP
    • KIMURA HIROMI
    • G01N1/32
    • PURPOSE:To determe orientation angle of fiber accurately by polishing a fiber reinforced plastic to provide a cross-section inclining at an angle within a predetermined range with respect to the reinforcing direction and measuring long and short diameters of fiber on the polished surface. CONSTITUTION:Reinforcing fiber 2 and basic material 3 may be combined arbitrarily so long as an FRP 1 is reinforced at least partially in one direction by continuous fibers. The fiber 2 has preferably right circular cross-section. The FRP 1 is polished to make an angle of 5-60 deg. with respect to the reinforcing direction. The FRP 1 may be polished solely or while being embedded in a resin. Polished FRP 1 is observed by means of a microscope. The microscope is selected from optical microscope, stereoscopic microscope, electronic microscope, etc., depending on the fiber diameter or sample profile. The fiber has elliptical cross-section and lond and short diameters (b), (a) thereof are measured. Assuming the inclination angle of the cross-section of the FRP 1 is theta, inclination angle (alpha) of the fiber with respect to the reinforcing direction can be determined according to the following formula alpha=¦theta-cos (a/b)¦. The angle alpha is measured for a plurality of fibers 2 and processed statistically thus determining the orientation angle of fiber.